I have a XPS 13 9370 with the same card and I'm seeing exactly the same. My card was being detected correctly in Ubuntu 18.04 but stopped being detected when I upgraded to the Ubuntu 18.10 development version.
I have a XPS 13 9370 with the same card and I'm seeing exactly the same. My card was being detected correctly in Ubuntu 18.04 but stopped being detected when I upgraded to the Ubuntu 18.10 development version.